In order to testify the mensurability of high SO₂ concentration and the variety of SO₂ with AML-2 mobile lidar,a measurement is carried out near a power plant. The fourth harmonic of Nd∶YAG laser is used to pump CH₄ and D₂ gas cell,and the first Stokes Raman-shifted wavelengths of 288.38 nm and 289.04 nm are obtained for SO₂ concentration measurement. The maximum of SO₂ concentration about 1300 ppb is got in the smoke way.2D mappings of SO₂ distribution are also presented which are detected on the windward and the leeward of the power plant. It comes to a conclusion that the exhaust gas from the power plant truly effects the environment nearby. The detecting ability of the AML-2 lidar on SO₂ is also proved.